Ars Magica Ireland campaign

Lough Neagh

Lough Neagh is a large lake in northeast Ireland, in the province of Ulster/Ulaidh, a few days walk in diameter – it is about 20 miles long and nine miles wide.
The upper Bann river, the Blackwater and a few other rivers flow into the lake, which is drained by the lower Bann. It is relatively shallow as it averages 25 feet deep.
The Blackwater flows into the lake about 2 miles west from Iniscrabhall, and the upper Bann enters the lake about 4 miles east of Iniscrabhall.
Log boats (coití) are the main mode of transport across the lake. Eels fishing is a major industry on the lake. At a certain time of year, copper eels run between the Bann and the Blackwater near Iniscrabhall, and when correctly prepared, can be used as a source of Intellego Vim.

There is some sort of legend about some sort of monster in the lake.
There are also a substantial population of water faeries.

Mythology:Echaid, son of Mairidh, the king of Munster/Mumhan, fell in love with his stepmother, Ébliu/Ébhlinne. They elope with their retainers, but their horses are killed in a battle. Óenghus (a god of love) then appeared and gave them an enormous horse. However, they are warned that the horse should not rest or it will be their doom.
Upon reaching Ulster, their horse stops and urinates, creating a spring. Echaid builds a house at the spring, and creates a capstone for the spring. One night, Echaid’s Capstone is not replaced and the spring overflows, drowning Echaid and his family and creating the lake.